But the government's security adviser Sean Boonpracong has told Australia Network's Newsline program the wait has been long enough.

"You have to understand this government has been more than incredibly patient for almost three months," he said.

Mr Boonpracong says he's not certain that the election commission has the right intentions.

"This body has only been in existence for less than three months but the so-called independent organisation is partially allied with those who support the coup," he said.

"All of them that came into existence, whether it's the election commission, the constitutional court, the human rights commission, the counter-corruption NACC, they more or less work in unison."

Middle class versus rural poor

Protesters took to the streets in November in the latest eruption of a political conflict that has gripped Thailand for eight years.

It broadly pits Bangkok's middle class and royalist establishment against the mainly poor, rural supporters of Ms Yingluck and her brother, ousted former premier Thaksin Shinawatra, who lives in self-imposed exile.

The protesters accuse Ms Yingluck of being a puppet of Mr Thaksin, a man they say is a corrupt crony capitalist who used taxpayers' money to buy votes with costly populist giveaways.

Even though Ms Yingluck's ruling party is certain to win the election, not enough candidates have been able to register to provide a quorum in the new parliament.

By-elections will have to be held later to fill the vacant seats, which means the prospect of a caretaker, and fairly powerless government under Ms Yingluck for several more months.

"Even if this is the worst case scenario, Thailand is resilient and in a Thai way we will resolve it," Sean Boonpracong said.

"For the past 20 years Thailand has faced many difficulties but we've managed to pull ourselves out of a situation and I'm optimistic."

The protests are taking their toll on the economy and even major foreign investors are beginning to question the merits of ploughing any more money into their Thai operations.

Protesters took to the streets of Bangkok again on Wednesday but in a relatively small rally of about 500 people.

They were without their firebrand leader, Suthep Thaugsuban, who was apparently deterred by the previous day's violence in which a protester was shot and wounded.